PHP Script enhancements 2

Need to make some adjustments to PHP Membership Script 1. Want to set price x units available at that price, track the numbers and when reached price rises. EG. 10 x 7, 20 x 9, 50 x 17, 100 x 27 ... The user would set normal price beyond the 27 Currently there are 3 prices in script - this would need to work for each price point, so its allowing a scale. One bit of data needs to be available to use on sales pages to display how many units left at X script is in use here [login to view URL] --------------------------------------------------------------------------------